<template>
  <div>
    <h2>随机点名</h2>
    <div class="box">
      <span>名字是：</span>
      <div class="qs">
        <span>{{ val }}</span>
      </div>
    </div>
    <div class="btns">
      <button class="start" @click="start">开始</button>
      <button class="end" @click="end">结束</button>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      uname: [
        "刘备",
        "关羽",
        "张飞",
        "赵云",
        "黄忠",
        "马超",
        "诸葛亮",
        "曹操",
        "夏侯惇",
        "孙权",
      ],
      i: 0,
      index: "",
      val: "这里显示姓名",
    };
  },
  methods: {
    start() {
      this.index = setInterval(() => {
        this.val = this.uname[this.i];
        this.i = Math.floor(Math.random() * 10);
      }, 50);
    },
    end() {
      clearInterval(this.index);
    },
  },
};
</script>

<style>
* {
  margin: 0;
  padding: 0;
}

h2 {
  text-align: center;
}

.box {
  width: 600px;
  margin: 50px auto;
  display: flex;
  font-size: 25px;
  line-height: 40px;
}

.qs {
  width: 450px;
  height: 40px;
  color: red;
}

.btns {
  text-align: center;
}

.btns button {
  width: 120px;
  height: 35px;
  margin: 0 50px;
}
</style>